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Appearance : white crystalline powder Purity wt% : â?¥99.80 Color no. Apha : â?¤5 Moisture: â?¤0.20 wt% Ash: â?¤4mg/kg Fe: â?¤0.4mg/kg  nitrate contentâ : â?¤3.0mg/kg Melting point: â?¥152.0â??